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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e1d5d4d257eb34d9ed8708ff7adbcaacb8e5f9e36a6ee2ce7fcdc683b4c65a' 
  AND token = 'GhY1+zjrVa0wfS6YEBUw8KSvhxqFYaB0lcbYSp1HPzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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