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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e917cc2420cf2daeed78346f8dbf132ef3cc3c05f8f47b272c6723c9dafe5cf' 
  AND token = 'OecxxiDiGuf6jpA87tIvxwS5ydqxAj+Xvh1IzM5GB1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}