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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '618c541fe6750c8fc3aca58c2ea64934c082f9b5c2fd4cfd444f0e2dd070680a' 
  AND token = 'xZCXEOzqoR8SCgMWh7OFHzrtU/vvXb3upxEVKNvqPEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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