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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87709e4800b7872c287a8373a9c37bfa45496c2971036a823d6f16a9d3d33611' 
  AND token = 'J/LyqdHHYlVVdvi8VoocpNi9bU3hqq/8eVBUfCRYN+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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