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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ae480629d438fad202fae20272056729322a93c468e6a695d58d42bfb6820d' 
  AND token = 'qgPUR8s/bXIsf43E2nEFLRpKDCNce2RS5jS7Ta+iSYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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