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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebae0bd5d64a6de829ee2e615b2d5039c8ce9e2dc3f9e7923552741c6d407c5b' 
  AND token = 'UURnP8SeojVF29H2wjsRs5FS415DGqczwmlP9MZZaN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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