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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b13c3459abd74275bdb28042c692c93a0c4d7f6878d40b0f0b43c86b12ac906' 
  AND token = 'V9PPtKhvb0llFMRFEqrk185w8rTtQGhIi2GaET/vKhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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