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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4e83848680d88d8c76bed635b0e7c18c87504c77043a7808663ec4fde3367a' 
  AND token = 'zJgU9YTlhyECRRKZ2S+BJScbTMzUYfA7/+29d7vJlR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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