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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6618c8e4e185831fc0bcd103794601b3ed14f385fd420949a02d83aafccf4725' 
  AND token = '6I7RVEPEe/FtvYNoyGYE+YNoEH2A9H8uxqA5BmApZaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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