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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '398d07dd8b90ea31486704c81cac4819f2b06d8028dd0760ce27c094a68fc1d3' 
  AND token = '1SA2RpipXCOv2rZw35ebS4hkR5KlR2WIwfNL60crsZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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