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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ee777f90f3dacb1117ac9177520cfb22971c7fa69049bc2748a515ff6a54e1' 
  AND token = 'evu6sDZbJ+fR902q6fSvHYluTVg1XOEFgA7RXqjUDIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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