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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a802fe2eb04544311708aba1f785344dcb1a409f1769be1b96c049ad7892fdf' 
  AND token = 'sj0tmn625UxNogO+LCm7dQq+PhnXth9jjSYL+jaQTZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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