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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0c93ef4038260e265f75e2e1ad622006c4e56733c7d480b4070febe9a76f74' 
  AND token = 'Ot5KUawyilhkHfPVhJbptv8S3GW3ghvbjIcZ/qsPt1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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