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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '252a8ab5a89fec7c53260742864edb891515036c996eddb3460d46d1003ff90a' 
  AND token = 'wUE5smc7HH5kp7tVtsWpq7B8z668C90u4MF6mCIIYJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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