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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e85e68605233e8b46b08434043801f73ad43cb946794b9186a4eb243926a07bb' 
  AND token = 'qNq76gRq7yU5wPEMbuAiVSdmLszdJE4R0U54U+y9RhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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