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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7cd4dfcd348a69ba65ca5b7dc21ed06800b5a6e8b7ecae039300d778a77de78' 
  AND token = 'BgQEt9XE4kLyIHg1YzcO7iU96NT+e9VRg4esQrBPFro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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