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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4575669a0dc07845c5f8afc9f9a9ccf9d71f0d11a49a4075adbb115e335aca5c' 
  AND token = 'D0Ihafg59vWECE4z6oSpLh8OCSCuDwpAI5pMND07X6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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