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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59c5c66a9a107e8f907065c6ea02f3d408001a79ea65db6f8df68025f3d4c2f1' 
  AND token = 'XvrShaPM0IqwSluMScSO3ZPhLFBJlZ4wmSD/6ootxbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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