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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c36a9c0351ce7f6173647c36602fed6fe2ee3f2232e5a0fdf8a1aec71203f19' 
  AND token = 'b8OkiiQRl5y75MafjFFfJH7Qo/oyXfEoHmfGbaN2RyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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