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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd046e536fcac31f1ea03f00c327c8a968bfd92f950fe74eee1834f9fcc5d71b4' 
  AND token = '8jU2NzsrTklQlaeBnbxENqA0yjCpM3RERYeirqVliWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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