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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1169a221316009b170f40b6b1b23252f5d482b6ad42e4a25a1659db05e5a15' 
  AND token = 'n/brLYbFqeKkTY4j8H7/5BmfIKM4UFYdwsXocZKKBaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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