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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929b9913335254f52c0e5ec48dcfc201cf268277332ee2f96d74cffcc4dc684f' 
  AND token = 'V4Hp7OlQKXHX3dJY1Cd/GKd27rxSTlmQM/oeK3C5yiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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