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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04760f9eab6394d386d7cdf3bac50b19b8453b11a58a9647d027b069798aee7c' 
  AND token = 'g26NEz+oKS+QMdYwR6/tDwK32E5dm8lHjr7v8Y+RffQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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