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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a5c148c304f8674e10f5d48beae2a05a17df22b4b421250ca0e3c1cb14268c' 
  AND token = 'iLiunu1nOvLcjlU0L2SU0XFbmMcZX6nlHtaNM6+rxkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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