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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713138cb83d8f83bd80a8dd1bd89ed4bee769765c3d90b7171e85f069f9967ee' 
  AND token = 'HjUFAzfm1VRDE0HXaIiTwoqa3Z5sS13BpFbjS4SkeDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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