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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9f62e265adf3174eca68e614e661daa16bb04efef06ff2706250ec21b5a1bd' 
  AND token = '7R7M5933TnZLxkf5Rja4JoCGVm/fWOmc1JmkxnAFCP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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