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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e698c79af9931c0f6a872d88056703f3e2ae4554e8deadef029fc8d22ba9f210' 
  AND token = 'OWObOQ0czmwZUzCKP6tW8A7VOVLA4apIsEsomLHTBFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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