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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43e1195290a39eb26a5fde59616ff7a1a9b2599f0ae251f80ef7ec9ddffc1869' 
  AND token = 'vmKlFYiyuj3tNtGk6lJ/9JIEK41kFyKcmf5T6hHf/JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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