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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd27e318247e62981dea89ac791d6d9f87cfe8b3130ca72c169fadb34a40027ab' 
  AND token = '7MlZj6JHQHo6gYyZ9F5VJgRl6wxNpqY6w4f3DgkboKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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