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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e6ca78fb2fff4be67680512826f026c19934764a9f8f5425d5ef5bb9ba4ae1' 
  AND token = 'Syj3NY3OJXQ1kO8Lmi7uhHdMs4AmRnCs7q7JxzrMChY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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