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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96bc6965be8b6b6f133267cc3743d802d352f54ae7ab0cb0a0b0434986a503df' 
  AND token = 'MJaSGK8lA5m8W22v8wE2qJfdHJykBOvEOwjnCuhIT2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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