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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0db46e7c30805567a086b3db62114d08e3c8e146571ea84a1673743037c7f7a' 
  AND token = 'L+3RtYLXCwLAkFZ/N2UKdkFwfw93fe9js7jqpdI3xKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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