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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790f18862bfb563140e429df3fd3445cdcb2edd93053e4f2cc5c6cda5c8b5e89' 
  AND token = 'YtF+HFLXJ6c4pMvOcrnD1qK9dp6gmvoSZSuMKQSeF/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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