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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909b4d06df1aa6e5cc4ee4f873795e14cb2b2ff3765aa734845ff5fa2c48af1d' 
  AND token = 'RG7WxBbmTTjYrweLHU4ENBE2PRdRjFrd7Tz9YXcI12Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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