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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f431fcae05c0daaa7bfed446702f80bbb3240d250a2dae58d5ba41d7660d3f59' 
  AND token = 'kku3V8jC88NZTGZFFd85q7ArQrApqlp0QsN3sxu+MTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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