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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1424cde8515a8bfeb6e112f8c0ec5edbbe516aa98e450cc802c43cc8f4d339' 
  AND token = 'WkMY1wNuoe9TI+Rwv0wMFWKE3NA3i1y6QRUlSXgvB0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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