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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c57e641ebe7ee9646e74c16fc166c65734e001d4879f6b643f340caa1e55e071' 
  AND token = '4skqY/c2QZT2qWlr7VcFEBaUl0COSnZwKAlUn9aJzQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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