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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb5db8d4a3dd3f7b8b164afd9de4a8b5b9a842728ae5259c8bb0e07e2a5ea0a' 
  AND token = 'YcQ0P4hGOltLVJfHaavP/VN3PRLkQkgDoMCTUbkNf9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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