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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a5368ae810f94d803258331cb72cf68b806859cb06fdadc73a451ba661a8fa' 
  AND token = 'N5SVkBHFYwhE0hLO1yitbZcHgYdViV23ZTiHA4eYpHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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