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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7608347c52d5be40a1962c8d047b14786731e6ad6b3cb9e5e20f68fc705fb6ef' 
  AND token = '9DISH68aAHE35IweOs0Oh7vNcJUi8XkYM/cSTCoTrRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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