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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4097d4cb2eeb1099ebcb776b40ca51892173e606203502b0f5f4c83e7dd632db' 
  AND token = 'Ha3yL9m+ESYJ1hn4efVX5EPm7q9lTz9fwdifFt7Dz2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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