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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92581be11814315525b164519d51d8a90b9129d7d8682d5c11c749cde5e8758b' 
  AND token = '54deoQK8wG+UrV5MY+m0sUAPObgQCC+4nGSxKLiGmMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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