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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360610238fb986e0cb07a9562d1eff54c0041ba82d7cfdf9f2354f5a778501e8' 
  AND token = '5AQ0qKRo2EY/LAWEtEfnzUFRwgBnNN0w3V52sVN2MNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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