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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c8f22dda661a5ce962c970a64f2d96f1066b1512b2d116fe42db17bd18f64d' 
  AND token = 'sj+hB8I3CpIXLV5MyC9AjZb6aB7VPoOVgIJfp6QpvQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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