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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e44b2f21f6be8919804aa31f7323ef823ec7926babc68bd8b4b7070f9cf61f' 
  AND token = 'xY5KrOjX1llWg0U6V/8kN5NutoNCmDIXHZtcZ/2pcOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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