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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33220524eea797616e5f608f1f7493fd42305fcf00afbed6c908fc8181703ec6' 
  AND token = 'qOVk24N66NhaD8tbcaA9AjknVUSu6x9X+9l2N600dkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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