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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc94139372ff7a150bea4024f6dc36f7c721f6cc96a602b7bae11b80d5aa08c' 
  AND token = 'QYxzhdjEHtxiubXdbZB+95oNihBctvH33wonynE0Y28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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