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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '862b52ccba9e6f077786245de96edf4be27fbf3b4cfc4fc7884c2c5dc950f752' 
  AND token = 'lLhcVthf2czKf+iT7a8ZoHik7Z/Yi3KUkrVpyp2IMco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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