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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef966ae31d70cdcb68057a4896449720aa19b22932e3fc356ee15299b03ab5fa' 
  AND token = '9haVHOk+7ww9CzsGpjqvT3YQQo3M0qFWk93o1veTOH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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