SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7f9104255dfb6d61a8937f6beb00b2137438a143a9e4c9bb9aaaa8e9ff0240' 
  AND token = 'ZJGQxcUQCQdvmSOV/FYyo54Kjuh+JfZclN5OrntvWM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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