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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d73aba029947db3f5490307bcd683bc6f2ff3164b272312f9c220401b7c2a9' 
  AND token = 'aVokMI7z8D/vH9cw8eOhDGLbxrJZs80bFN56t+u9Juw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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