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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936541fe468e0f7905897c3201a9eb6923e85534b9f054e4cdd28bdf8277551d' 
  AND token = 'niURjsIy4e0/tVM1HYqrlWryDO5ouFRIv5uVmDyCPeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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