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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62cb06992297d932361fd66368b920a15173c2a84927de0b310fc04a3bc887b' 
  AND token = 'GY1pzLl7EYmvk+FPaINh28xE3B+wvASwzcKoAh6adLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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