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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82253fd20fab823ab6e0b285b3f9891403acf9fd8106d23b54a244307b02838d' 
  AND token = 'I2n/2v12hil9ro5mQXGkOxMy6P5+CAjh7ZEMYbIojEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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