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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac99198e932592a465a104892619cac7c2a20c5c4b230d19e182ac99ea963b0a' 
  AND token = 'br+1cFCvzq+qNKBoKUXI2ffNSepNAunnPun9NAf5YtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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