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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bbd3a3364c6db8f429feca95b819fd51699f4c0313fc28af2f34cd173041a0a' 
  AND token = '8AJtjnxQn7a/T2CQvbR29vdzXpjXx4VZbCsI0ChkPrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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