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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8f120b3b3162b8d993356be6ac3da0a2c9d6d1c4a896a83d0d56671b519b64' 
  AND token = '3NpbyxsD9clMwiyWI6L+MyYjlCU6xT+CDxypFfVqndg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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