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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efdd363d2b45fd55fe2ced10b356f93ec30eae3eb7df323e7cae30d5fc93de1e' 
  AND token = 'lv7taiKgU+sCuIHQ6m+bD7jjTEQIgEvcUqceXrReyRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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