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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bce61aceb7283adb07acf9d9b04ecf6e43d584a1056435c550f664b3830ab92' 
  AND token = 'yrNmjMC1qh3l3lxmj+g0qkIXAefLWnidrDuV5G6M6lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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