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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4c6bd518b6a659a421fc90d5faf92b53435a505130f9d4ed83df537944b333' 
  AND token = '5z11M6wl5QDLDMDCoIgMF1JiMIsf5Egd3Y9s7yfnkkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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