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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3822f969d88f4ffb34760fa5e4683ac201732f8301230fb7b171d1b8d27eadc4' 
  AND token = 'vn93MwC5yDZKGK4mw7i/evWn7kM03Cd9lpJPNxvZFv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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