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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3153e957bf78fc8c2ff8cd178faf0ac976faa04418d60eab3904b7308de5189f' 
  AND token = '94ioPB0JTyExeVmHnfTJg6FNWaVm5WKaB04vpo43pTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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