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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b24734a1301b2649e43381dc79c168d0cf1f406560b286aca79673006112b13b' 
  AND token = 'IxLhVvF7rLREpIrcZuiRsHcwMRx+uu7nhGpoLFF8/vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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