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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a71b56c776e418e1ff10ce60902803360d7c018b111e50739071046296eaf2' 
  AND token = '5m3HBxmFqtWdtL4qwFyjh22fI2ONArN4OpIFEwU3E9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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